Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfa375a6d3f674b…

MALICIOUS

PDF

46.1 KB Created: 2020-08-07 19:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24fab8f1caad910ba0d6db33da90f948 SHA-1: dcde69996338b865a004e08c9db1ceb8ff349f55 SHA-256: bdfa375a6d3f674b5620ecb151da126a9b317c5ac51abe2b5644555f94ed4f8d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains the same URL and a benign-looking title, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=catalog+interior+design+pdf
    • http://wusunodow.glenoakspark1.com/uploads/1/3/1/3/131384771/konefipozinul-muzukepaxiwajaf-degepovefur-roneripi.pdf
    • http://norabew.topeducationltd.com/uploads/1/3/1/6/131606349/fb806e0.pdf
    • http://files.toddthomasrenos.com/uploads/1/3/1/8/131856076/5586234.pdf
    • http://norabew.topeducationltd.com/uploads/1/3/1/6/131606349/fb
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/17687247603.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/28150068323.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8890/files/69566074941.pdf
    • https://cdn.shopify.com/s/files/1/0439/3231/9899/files/flatten_2d_vector.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/nuguxadadixifopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/ravusuduzidedokasurakuni.pdf
    • https://cdn.shopify.com/s/files/1/0428/4583/1335/files/discord_channel_rules.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/applied_mathematics_project.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fodafozisejuleluz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3591/8489/files/bawexifisukinuzolugider.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/13522883028.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ed.bin
e7c88d218ec2519c50e11d65ef63dacccf546bc91e98b7fb2aa6880c0935a610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67ED 5020 bytes
font_01_sfnt_off00007910.bin
5c56a295a78bd0ff312c2e89f93eab35bea106b42081a26a7f7338739058b0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7910 10592 bytes
font_02_sfnt_off00009d33.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D33 4324 bytes

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